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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 466 (ENGINE CONTROLS AND FUEL - 4.6L - DTC P0335 TO DTC P2544)DTC P0455CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Testing

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  • Refer to the J 41413-200 operation manual for detailed instructions.
  1. Connect the J 41413-200:  EEST to the vehicle EVAP service port. For vehicles without a service port, disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH 48096:  Port Tool.
  2. Seal the EVAP system and use the flow meter on the J 41413-200:  EEST calibrated to 0.51 mm (0.02 in) to determine that there is no leak in the EVAP system.
    • If a leak is detected, use the J 41413-200:  EEST to apply smoke to the EVAP system at the service port until the leak is located.
  3. To test for a restriction, connect the J 41413-200:  EEST nitrogen/smoke hose to the J 41413-311:  Plug brass cone adapter. Disconnect the hose at the fuel cap end of the GE 41415-50:  Cap Adapter. Connect the J 41413-311:  Plug to the disconnected hose on the GE 41415-50:  Cap Adapter. Install the GE 41415-50:  Cap Adapter filler neck end only to the vehicle.
  4. Allow the engine to idle.
  5. Use the Purge/Seal function to seal the system with a scan tool.
  6. Command the EVAP canister purge solenoid valve to 30 percent.
  7. The vacuum/pressure gage on the J 41413-200:  EEST and the FTP parameter on the scan tool should both show vacuum.
    • If the vacuum/pressure gage shows vacuum but the FTP parameter does not show vacuum, replace the FTP sensor.
    • If neither the FTP parameter nor the vacuum/pressure gage shows vacuum, repair the restriction in the purge path. Refer to Evaporative Emissions Hose Routing Diagram .
  8. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 volts, and the value is closely similar between the scan tool and the vacuum/pressure gage on the J 41413-200:  EEST.
    • If the values are not similar or the voltage did not reach 3.2 volts, replace the FTP sensor.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.